Battery to battery (DC to DC) split charge systems.

DC to DC battery split chargers are very simple to fit as these units only needs wiring from the starter battery to the leisure battery. No connection to the alternator is required.

The difference between DC battery chargers and other split charge systems is that the DC battery charger uses it's own micro-processor system to determine the actual level of charge in the leisure battery and tricks the alternator into providing extra charge for long periods in order that the leisure battery reaches full charge.

Confused? Let us explain further...

As stated previously a split charge relay is governed by what the vehicle alternator does. When the leisure battery voltage rises to a certain level (surface charge) the alternator will cut down it's charge rate to minimal amps because it thinks the battery is now charged. In most cases (i.e. light caravan and camping uses) where the leisure battery is not deeply discharged this would be acceptable. However, if the battery is deeply discharged the alternator will cut back too early because it can't differentiate between what is just surface charge (i.e. the voltage has reached a level, but the battery actually needs much more charging) and what is full charge. This is where the DC battery charger comes in... Basically it reacts the same as a top quality mains battery charger, but instead of using mains electricity is uses power from the alternator and it will keep demanding that power until the leisure battery's actual full charge is reached.

So, to summarise, if you use a lot of leisure battery power and deep discharge the battery/batteries regularly then the DC battery charger should be your preferred option. Popular brands include Ring Automotive, Ctek and Sterling Power.

DC Battery Split Chargers are also suitable for the latest vehicles with regenerative braking systems.

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Need to know more? See the examples below.